Aston Martin The roadster variation of the V8 Vantage uses the same mechanicals as the coupe, which means a dry-sump 420-horsepower 4.7-liter V8 driving the rear wheels via a choice of six-speed transaxles. There is a traditional, three-pedal manual or an optional Prodrive-developed automated manual (Sportshift) with paddles swapping cogs or a fully automatic roadster variation of the V8 Vantage uses the same mechanicals as the coupe, which means a dry-sump 420-horsepower 4.7-liter V8 driving the rear wheels via a choice of six-speed transaxles. There is a traditional, three-pedal manual or an optional Prodrive-developed automated manual (Sportshift) with paddles swapping cogs or a fully automatic mode